Drilling machine



April 21, 1931- w. scHUi'aBE DRILLING MACHINE Filed March 5, 1927 5Sheets-Sheet l Mfiiie.

l/IVENTOR April 21, 1931.

W. SCHUBBE DRILLING MACHINE Filed March 5, 1927 5 Sheets-Sheet 2 M c AINVCIVTUQ 77/Mw%@ APril 1931- w. SCHUBBE 1,801,881

DRILLING MACHINE I Filed March 5, 1927 5 Sheets-Sheet 3///IIIIIIIIIIIII/III]I/IIIIIIIII/IIIIIIIIIIIIIIIIIIIIIIIIIIIIIII/IIIIII/IIIIIIIIIIIIIIIIIIIIIIIIII/ April 21, 1931. w. SCHUBBE 1,801,881

' DRILLING MACHINE Filed March 5, 1927 5 Sheets-Sheet 4 April 21, 1931.w. SCHUBBE 1,801,881

DRILLING MACHINE Filed March 5, 1927 5 Sheets-Sheet 5 h/ScAZlAAe.

Patented Apr. 21, 1931 UNITED sm'res.

WILLY scnt'IBBE, or GERA, GERMANY DRILLING MACHINE Application filedMar-ch 5, 1927, Serial No. 173,095, and in Germany March 3, 1926.

, This invention relates to 'a high-eificiency drillinginachine, thechief .feature of which resides therein that the drilling spindle isarranged centrally between two columns connected at their lower ends byafoot plate and at their upper ends by dbOX-llliG head bridge. Otherfeatures consist, firstly, therein that the drilling spindle is drivenby a belt tightening gear enclosedin said head bridge and arrangedbetween the shaft ofathe driving motor located vertically uponthesaidbridge and the drilling spindle; secondly, in'the particular designof the feed gear for the spindle stock orhead stock, as well'as ofv therotatory work table, and finally, of various other mechanisms andmembers, all as fully described hereinafter.

The invention is illustrated diagrammatically and by way of exampleonthe accompanying drawings, on which Figure 1 is a front-view of themachine, Figure2'a sepa rate view of the rotatory multiple workingtable, Figure 3 a plan'of this table Figure 4 showssome details of oneof theiindividual working tables proper, partly in vertical sec tion,and Figure 5 shows also some details also invertical section, but atright angles'to Fig. 4, viz.-in the plane A-Bof this" latter figure;Figure 6 is aplan of thebase plate of the machine, Figure 7 a horizontalsection through the head bridgein the plane GD of Fig; 1, this Fig; (7).being dr'awnto-an enlarged scale; Figure 8 is partlya front-view of, andpartly a vertical section through, the 5 head bridge, the scalebeing'the same'as that of Fig.- 7; Figure 9 is a vertical sectionthrough the righthand upper partof the machine in the plane E'F 'of Fig.1 and drawn to a still more enlarged scale than Figs. 7' and 8; Figure10 is agreatlyenlarged front-view of thefeedingmechanism (middle portionof the righthandhalf of Fig. 1', butwithan'other position of the'armsand Figurel lis a horizontalsection in theplane of Figs. 1 and 10.

On Fig; 1 of thedrawing 1 denotes two strong columns or standards'ofcircular section which are connectedat their feet bythe base plate 7and: at their heads-by a strong hollow head bridge 4e that supports theVer tical ele'ctrornotor 6.. 2 denotes the boring spindle and12 a socketattached to the lower end of this spindle and receiving the drill. Thespindle 2 is located centrally between the columns 1 and cannot beshifted laterally in 55 the direction to any one thereof. The columnsare therefore subjected solely to the action of axially acting forces,but never to a bending stress. 3 denotes the spindle stock orhead stockwhich is guidedvertically along the columns 1; that is to say, thecolumns serve as guidesfor sleeves 18 andlt firmly connected, or madeintegral, with the spindle stock. The weight of the spindle stock iscountcr-balanced by poises 9=guided within the hollow colunins'l andconnected with the spindle stock by chains 10 guided over suitablearranged guide rolls. One of the columns 1 serves also as guidemember-and holder for three individual working tables 16 carried bybrackets 8 projecting forth radially from a sleeve 15 encompassing therespective column 1. Any of'the three tables can, therefore, be movedto'below the drillholding socket 122 5 The base plate 7 supports nearthe other column a switch box 17 enclosing the electrical switchesrequired. 18 denotes an oblique channel for the waste oil, 19 acollecting vesselfor'the same, and an oil-pump. The driving mechanismfor the drilling spindie is designed as follows: The verticalshaft ofthe electromotor 6 is provided with a pulley 5 (Figs. 7 and 8) driving alarger pulley 22 by means of a belt 21 with the aid of a tension pulley20. The pulley 22 is afiixed to the drilling spindle 2. Allthe'sepulleys constitute a belt tightening gearing and areenclosed in the headbridge i. This latter encloses also the feed-mechanism for the drill.

of difierent diamet r as usual; and mesh with counterwheels 30 30 30 30,as shown in Fig. 9. These latter wheels are located on the so-calleddraw-key shaft 31 (Figs. 711) by which the feed-gear 32 (Figs. 8 and 9)is actuated. This gear or mechanism" comprises a worm 33 (Fig. 11), aworm-wheel 34 meshing therewith and attached to a spindle 35, and a rack36 (Fig. 10) by which the drilling spindle 2 is operated.

Although I prefer to locate the changewheel mechanism within the headbridge, as in Figs. 8 and 9, still, I wish it to be understood that itmay be arranged also in the spindle stock.

Throwing the feed mechanism into, and out of, gear is effected by thelever 37, Figs. 1, 10 and 11. When this lever is depressed, obliqueteeth 38 shift a member 39 of a clutch rearwardly whereby roof-shapedteeth 40 of this member are made to engage corresponding teeth 41 of thecounter-member of the clutch and the rotatory motion of the worm-wheel34 is transmitted to the spindle 36, the drilling spindle 2 being nowmoved downwards.

Stopping the forward feed takes place automatically and is effected bythe following means: The spindle sleeve 42 is connected with a verticalrod 44 (Fig. 10) which is moved up and down with it by an arm 43, andcarries an abutment member 45 by which the depth of the bore isdetermined. This member is clamped fast to the rod 44 and can beadjusted along it. A projection 46 of the abutment member 45 contacts onthe downward movement of the spindle 2 with a release lever 47 and turnsit until a pivot 48 to which the lever 47 is secured has been turned somuch that a lateral recess 49 (Fig. 11) provided in the projecting otherend of said pivot permits the lever 37 to swing back into its formerposition. This lever had been retained up to then with its opposite end50 by the edge 51 of the said pivot. The helical spring 52. Fig. 11,which had been compressed when the two members constituting the clutch39 were coupled with each other, disconnects these members and theoblique teeth 40 and 41 turn the lever 37 into its initial posit-ion.

The interruption of the feed may be effected, however, also at will andat any point of time, for instance while the drilling is just going on.There is provided for this purpose a projection 53, Fig. 11, at thelever 47 by which this latter can be turned manually at any desiredpoint of time whereby the actions just described and taking placenormally automatically and resulting in the lever 37 re-assuming itsinitial position can be effected at will at any desired point of time.When the lever 47 is not depressed. it is supported by a helical spring54, Fig. 10, by which it is held in such a position that the edge 50 ofthe lever 37 can co-operate with the edge 51 of the recess 49 of thepivot 48 in the manner described.

From what has been explained appears that only one short manualoperation is necessary to throw the feed mechanism into gear, theclosing of the clutch 39 and the checking of the release can be effectedsimultaneously by one grip. When the release has been effected(automatically or manually), the drilling spindle is lifted by turningthe hand cross 55, without no such other manipulation as are requiredwith all other constructions I have become acquainted with. The machinecan, thus, be attended to very quickly and the operations can be carriedthrough in quick succession. The machine can, therefore, justly betermed a high-efficiency one.

Concerning, finally, the working tables, their construction is asfollows:

It has already been explained that the three working tables (16, Figs.13) are supported by radial brackets 8 extending forth horizontally froma sleeve 15 encompassing one of the columns 1. Vertically below thedrilling spindle 2, or the socket 12 respectively, is a standard 57(Figs. 2, 4 and 5) which serves as support for that working table 16that is located just below the drill. It is a matter of course, that thework piece to be drilled must be able to withstand the pressure, and itis also necessary to couple the respective table with the standard 57.For this purpose a vertically movable locking bolt 56 (Figs. 2, 4 and 5)is provided which forms a truncated cone at its upper end and issubjected to the pressure of a. helical spring 58 by which the lockingbolt head is retained in a suitably shaped recess provided in each ofthe three brackets 8. The locking bolt is connected with a treadle 59 bymeans of rodding 60 so that it can be withdrawn from the respectivebracket by means of said treadle which the workman must depress with oneof his feet. When the bolt 56 has been withdrawn, the three tables canbe turned around the column 1 by any one of the grips 61. The locking ofthe next used table (irrespective of the direction of rotation of thethree tables) takes place, however, automatically, in that the lockingbolt after having been relieved from the pressure of the foot (upon thetreadle 57 is again depressed by one or the other (according to thedirection of rotation) of two oblique faces 62, Fig. 5, at the upper endof which the conical bolt-top jumps into the recess provided for it inthe bottom face of the table.

The top face of each working table is provided with grooves into whichflows the surplus of the oil or of the cooling fluid employed while thedrilling operation proceeds. That surplus flows then down from saidgrooves through suitably provided holes into a small chamber 63, Figs. 4and 5, from which it is conducted further and away to and through a pipe64 down upon the base plate 7 in which are provided broad grooves 1 8,Fig. 6, from which the oil etc. flows to an into a main collecting space19 near which is provided a pump 65 that presses the oil into a pipeconducting it back to the drill. I I claim: A drilling machinecomprising in combination, a base plate, two spaced vertical columssupported on said base plate, a hollow bridging head supported by thecolumn at the upper ends thereof, a drilling spindle arranged mediallybetween said columns and parallel thereto and vertically slidablethrough the bridging head, a driving motor having its shaft normal tothe bridging head and extending thereinto and laterally of said spindle,a transmission mechanism arranged within the hollow bridging head andconnecting the motor shaft with said spindle and including an endlessflexible driving member and a tension element, and means ar rangedpartly within the bridging head and operable by the rotation of saidspindle whereby said spindle may be moved in either direction, saidlatter means including change speed gearing located within the hollowbridging head, another spindle within the head and depending therefromand associated with the said latter gearing, and an operable connectionbetween the second spindle and the first mentioned spindle.-

In testimony whereof I affix my signature.

WILLY soHt'iBBE.

